1. Radiological Assessment
- of effects from -
Fukushima Daiichi Nuclear Power Plant
May 13, 2011

2. Monitoring Results: Sendai to Tokyo
• Results show radiation levels along Tohoku Shinkansen Bullet Train
• The integrated dose was measured with a calibrated electronic
dosimeter by a field team member riding the train as a passenger,
and includes external exposure but not inhalation.
• The dose rate was recorded every 3 seconds with a calibrated
scintillator.
• All measurements were made inside the train.
• The dose rate in some stations is significantly lower than along the
tracks outside the station; possible evidence of decontamination.
• The dose rate measured in the train is expected to be different from
that measured by AMS because the train is often elevated (further
from deposited activity) or in tunnels (unaffected by released
activity).
• The contamination on track beds may weather differently than on
other surrounding ground material. 2

3. Monitoring Results: Sendai to Tokyo
Note: 1 milliRem (mRem) = 10 micro)Sieverts;
1 milliRem (mRem) = 1000 micro)rem

5. AMS Operations Summary
• DOE/NNSA Aerial Measuring Systems have totaled more than
507 flight hours in support of aerial monitoring operations
• NNSA’s Consequence Management Response Teams have
collected over 269,500 total field measurements taken by DOE,
DoD, and Japanese monitoring assets
• More than 514 air samples taken at U.S. facilities throughout
Japan undergoing lab analysis in the United States
• 148 total in situ ground spectra taken throughout Japan for lab
analysis in US
• 115 Japan soil samples received, in-processed, and undergoing
analysis

6. Joint US-Japan AMS Data
• These results are from a joint MEXT, DOE/NNSA and USFJ survey
• Data based on 42 fixed wing and helicopter survey flights at altitudes
ranging from 150 to 700 meters between April 6 and April 29
• Exposure rates are averaged over areas 300 m to 1500 m in diameter
• There is no data near the Town of Inawashiro because it is
mountainous and not easily accessible by low-flying aircraft
• The cesium deposition was determined from aerial and ground-
based measurements
• The ratio of the amount of Cs-137 to Cs-134 is uniform across the
survey region
• There is no aerial survey data directly over the nuclear power plant
itself
• The survey boundary was chosen based on many preliminary
measurement that showed the extent of the deposition

7. Joint US-Japan AMS Data
7

8. Joint US-Japan AMS Data
8

9. Assessment
An assessment of measurements gathered through May 13 continues to
show:
• Radiation levels continue to decrease
• No measurable deposit of radiological material since March 19
• US bases and facilities all measure dose rates below 32 microrem/hr
(32 millionths of a REM)** – a level with no known health risks
• Agricultural monitoring and possible intervention will be required
for several hundred square kilometers surrounding the site:
• Soil and water samples are the only definitive method to
determine agricultural countermeasures
• Ground monitoring can give better fidelity to identify areas
that require agricultural sampling
** Note: 1 milliRem (mRem) = 10 micro)Sieverts;
1 milliRem (mRem) = 1000 micro)rem
9

10. Context
• The Nuclear Regulatory Commission estimates that the average
American absorbs 620 mRem a year* (or 0.071 mRem/hour)**
• An average transatlantic flight produces an exposure of 2.5
mRem*
• A typical chest x-ray produces 10 mRem per image
• EPA guidelines call for public health actions if exposure exceeds
1000 mRem over 4 days
* Source: NRC: http://nrc.gov/images/about-nrc/radiation/factoid2-lrg.gif
** Note: 1 milliRem (mRem) = 10 micro)Sieverts;
1 milliRem (mRem) = 1000 micro)rem

11. ** Note: 1 milliRem (mRem) = 10 micro)Sieverts;
1 milliRem (mRem) = 1000 micro)rem